Players of Week -- RHP Jeff Reardon of the Montreal Expos, who appeared in four games and saved all of them, was honored by the National League, and Gary Ward of the Texas Rangers, who hit .444 with six extra-base hits, was the choice of the American League for the week ending Sunday. Minnesota Twins -- Announced LHP Len Whitehouse has been brought up from AAA Toledo for bullpen duty; did not announce who will be sent down. Detroit Tigers -- Placed IF Chris Pittaro on 15-day supplemental DL with groin injury. Recalled IF Dave Bergman from Nashville. New York Mets -- Optioned LHP Rick Aguilera to AAA Tidewater and said they planned to activate LHP Calvin Schiraldi. Announced RHP Brent Gaff, who has been on the DL all season, will undergo exploratory arthroscopic surgery on his right shoulder Friday. Rochester Red Wings -- Reported OF John Shelby was named International League player of the week. Shelby batted .458 with 11 hits in 24 at-bats. FOOTBALL

Pittsburgh Steelers -- Announced first-round draft choice Darryl Sims, a DE from Wisconsin, is missing from their minicamp. Sims had told the team he would report with other rookies and free agents Sunday, but changed his mind when his agent couldn't work out an agreement over the issue of compensation for any injury incurred before signing a contract. USFL -- Named Herschel Walker, who gained 166 yards and scored three touchdowns Sunday in the New Jersey Generals' 30-24 victory over the Tampa Bay Bandits, its player of the week. Walker, who leads the league with 1,758 yards rushing on 330 carries for a 5.3 average, needs 55 more yards to break his USFL record. HOCKEY

Detroit Red Wings -- Purchased the remainder of a two-year contract with C Darryl Sittler in order to release him. The buyout allows Sittler to become a free agent July 1. Boston Bruins -- Announced signing of LW Kraig Nienhuis, who played with Rensselaer Polytechnic Institute's NCAA champions last season. COLLEGES

Ohio State -- Said former football Coach Woody Hayes is in good condition at a Columbus (Ohio) hospital, where he is being treated for a stroke he suffered last week. Announced two-time Heisman Trophy-winner Archie Griffin, who recently retired from professional football, has been named a special assistant to Athletic Director Rick Bay.